桉木木质素磺酸钙与丙烯酸接枝共聚物的分离与表征

Separation and Characterization of Graft Copolymer from Eucalyptus Calcium Lignosulfonate and Acrylic Acid

中文关键词:  桉木木质素磺酸钙  丙烯酸  接枝共聚物  分离  结构表征

Key Words:eucalyptus calcium lignosulfonate  acrylic acid  graft copolymer  separation method  structure characterizations

中文摘要:

      针对Fenton试剂引发桉木木质素磺酸钙(HLS-Ca)和丙烯酸(AA)单体接枝反应体系，研究了传统沉淀-索氏抽提分离方法的提纯效果，在此基础上提出了离心分离-索氏抽提联用的新分离提纯方法并对该方法的分离效果进行了考察，分析了HLS-Ca、接枝共聚物（HLS-AA）的FT-IR、UV和1H-NMR谱图特征。结果表明，离心分离-索氏抽提联用法具有优于传统沉淀-索氏抽提分离方法的分离提纯效果，可用于HLS-Ca和AA接枝共聚体系各组分的分离。HLS-AA在210 nm左右的UV吸收峰强度明显高于HLS-Ca，FT-IR谱图中1727 cm^-1处的吸收峰为HLS-AA的羰基吸收峰，1H-NMR谱图中化学位移为10~14处的吸收峰为HLS-AA的特征吸收峰。

Abstract:

      Graft copolymerization of eucalyptus calcium lignosulfonate (HLS-Ca) with acrylic acid (AA) was carried out using Fenton regent as a redox initiator. The separation efficiently of traditional precipitation-soxhlet extraction method was investigated, and a new centrifugal separation-combined with soxhlet extraction method was proposed. The chemical structures of HLS-Ca and the graft polymer (HLS-AA) were characterized by FT-IR, UV and 1H-NMR. The results showed that compared with traditional method, the new separation method is more effective to separate the graft polymer from homopolymer and unreacted HLS-Ca. The band at 1727 cm^-1 in FT-IR spectrum is assigned to carbonyl absorption; the stronger absorbed band at 210 nm in the UV spectrum can be observed in HLS-AA and the signals between 10 and 14, assigned to the absorption for carboxyl hydrogen, also can be observed in the 1H-NMR spectrum of HLS-AA．